Abstract Herein, the electrochemical and photodegradation properties of magnesium ferrite and graphene-nanoplatelets nanocomposites, (MFO)1-x(GNPs)x, (x = 0.25, 0.50, 0.75) are reported. Benefitting from the effective interfacial interaction of the bi-phase nanocomposite and superior electrical conduction of GNPs, a significant enhancement in supercapacitive performance has been demonstrated. Interestingly, the electrochemical properties of nanocomposite electrode were found to depend on the loading ratio of GNPs. Notably the (MFO)0.50(GNPs)0.50 (50 wt % GNPs) showed an outstanding energy storage capacity of 612 Fg–1 at 0.5 Ag–1 with 21.25 Wh kg−1 energy density at power density of 125 W kg−1 and retains ∼76.8% of the first cycle capacitance after continuous 1500 charge/discharge cycles. Furthermore, the (MFO)0.75(GNPs)0.25 (25 wt % GNPs) composite demonstrates admirable photodegradation efficiency (99.3% in 60 min of visible light illumination) which is 3.2 times than that of neat MFO nanoparticles. The superior electrochemical and photodegradation performance suggest that the prepared nanocomposites can be effectively utilized in high‐performance energy storage devices and low cost, eco-friendly water purification systems.

中文翻译：

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多功能MgFe2O4/GNPs纳米复合材料：石墨烯促进的可见光驱动的MgFe2O4纳米颗粒的光催化活性和电化学性能

摘要 本文报道了铁酸镁和石墨烯-纳米片纳米复合材料 (MFO)1-x(GNPs)x, (x = 0.25, 0.50, 0.75) 的电化学和光降解性能。受益于双相纳米复合材料的有效界面相互作用和 GNP 的优异导电性，已证明超级电容性能显着增强。有趣的是，发现纳米复合电极的电化学性能取决于 GNP 的负载率。值得注意的是，(MFO)0.50(GNPs)0.50 (50 wt % GNPs) 在 0.5 Ag-1 时表现出 612 Fg-1 的出色储能容量，在 125 W kg-1 功率密度下具有 21.25 Wh kg-1 能量密度和在连续 1500 次充电/放电循环后，仍保留约 76.8% 的第一次循环电容。此外，(MFO)0.75(GNPs)0。25 (25 wt % GNPs) 复合材料表现出令人钦佩的光降解效率（在可见光照射 60 分钟内为 99.3%），是纯 MFO 纳米颗粒的 3.2 倍。优异的电化学和光降解性能表明所制备的纳米复合材料可有效用于高性能储能装置和低成本、环保的水净化系统。